/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraMessageManager.h
void AddMessage ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< const [INiagaraMessage](API\Plugins\NiagaraEditor\INiagaraMessage) > & InMessage, const [FGuid](API\Runtime\Core\Misc\FGuid) & InMessageAssetKey )